Reproductive Ecology of Male and Female Strobili and Mating System in Two Different Populations of Pinus roxburghii

Table 5

ANOVA of the effect of year and altitude on number of Pollen strobili, microsporangia, and pollen grains per tree in P. roxburghii.

Response variable and source	1				2				3				4				5
	a	b	c	d	a	b	c	d	a	b	c	d	a	b	c	d	a	b	c	d
df	3	1	3	680	3	1	3	487	3	1	3	741	3	1	3	782	3	1	3	467
𝑃	0.000	0.0014	0.0263		0.2442	0.0122	0.2876		<0.0001	0.0005	0.0292		0.0001	0.0002	0.0146		0.2246	0.0112	0.2672

1:Number of pollen strobili per tree (𝑅²=0.692), 2:Number of microsporangia per strobilus (𝑅²=0.568), 3:Number of microsporangia per tree (𝑅²=0.856), 4: Number of pollen grains per tree (𝑅²=0.612), 5:Number pollen grains per microsporophyll (𝑅²=0.468). a: Year, b: Altitude. c: Year × altitude, d: Error.